Centrifugal pump.



F. W. KROGH.

CENTRIFUGAI. PUMP.

APPLICATION FILED IIILY I7. I9I3.

WITNESSES ATTO R N EY.

I". W. KROGH.

cENTmFuGAL PUMP.

APPLICATION FILED JULY I7. III3. v 1,163,242, Patented Deo. 7, 1915.

2 SHEETS-SHEET 2.

WITN ESSES ATTO R N EY.

. nu, M7@

` .To all whom t may] concern.'

ASamaras CENTRIFUGAL PUMP.

specification of Letters Patent.

rateateanee. 7,1915.

Application mea Juiy 17, 191s. serial No. ricain.`

Be it known that I, FERDINANp1W ..KnoGi I, of San Francisco, California,have invented certain new and useful Improvements in Centrifugal Pumps,whereof the following is a specification.

This invention relates to centrifugal pumps, not only those that areused for deep well pumping, but also contractors" pumps, such as areYused for keeping a place dry while work is progressing and also relatesto certain features disclosed in my applicationjiled Jan. 6, 1913,Serial No. 740,299. The objects of the invention include; the balancingof the impeller; the easy removability and replacement of all partssubject to wear and the prevention 0f tools or other objects which mayaccidentally fall into the discharge from entering the body of the pumpwhere they might cause damage.

To these ends the invention comprises a pump casing provided with asuction and a discharge, an impeller mounted therein and by its rotationcausing the water to enter at the suction and pass out of the discharge;

a chamber at the upper part of theirnpeller,

closed by a diaphragm in the casing above the impeller, whereby leakagefrom the discharge entering said chamber causes a pressure therein andpushes the impeller toward the suction; ports in the diaphragm connectwith a space above the same from which openings connect with the outsideof the casing so that the water may be thrown through said ports andspace and into the body of water outside the pump; a chamber beneath theimpeller surrounding the suction thereof,

and connected with the discharge, whereby the pressure of the column ofwater in the discharge opposes the suction; a grating inthe dischargeabove the bodyof the pump; the making of said diaphragm and other partseasily removable; and including a removable bushing c at the suctionorifice, whereby the parts subject to wear are easily replaced.

In the accompanying two sheets otv drawing, I have shown my invention asapplied to a single unit pump, it being understood that it may beequally `applied to tandem pumps in which the several units may beidentical with the one shown or otherwise.

In the drawings ,Figure 1 is a sectional elevation through the center ofthe pump.

Fig'. a top View ofthe casing showing the grating, and Fig. 3 is aninverted secj a pump connected by the Harige joints 2;

with a discharge 3, and/provided with a suc- 'tion 4 connected to it bythe ange joint at 5. The pump may also be provided with a suction pipe6, secured to it by the flange joint 7 when desired.

8 is the impeller mounted upon the shaft 9, andsharpened toward thesuction end, as shown, to reduce the resistance of the inflowing water.

10 are the usual impeller arms, which need not be further described.

Under the impelleris a chamber 11 surrounding the suction and connectingwith the discharge portion of the casing at 12, whereby the pressureofthe water in the discharge acts upon the under side of the impeller,and tends to push it up away from the suction. j

The impeller includes a downward extending annular flange 13 forming thethroat thereof, which partly enters into the suction orifice fand formsa connection therewith at all times in the movement of the impeller.Surrounding this flange 13 is a bushing 14, provided with a'flangeportion 15, by which it may be secured tothe casing 4. The upper part ofthe impeller includes a longitudinal flange 16, and an inward extendingtransverse flange 17, which parts form a chamber 18 in the upper part ofthe impeller.

19 represents the bearing for the shaft 9 in the casing. At. thelowerredge of the bearing 19 there is a diaphragm 20, provided with adownward extending flange 21 at its periphery which embraces the ange 16of the impeller. These parts are secured to to the hydrostatic head inthe discharge,

tends to force the impeller up away from the suction, and into theposition shown in Fig. 1;- While in lthis position, the leakage of Waterthrough the joints betweeirthe im'v peller and the diaphragm 20, and itsflange 21, produces a pressure in the chamber 18, and against the underside of the diaphragm i 20, and tends `to push the impeller away fromthe diaphragm. Such movement of the impeller opens the ports 23, and thewater in chamber 18 is thrown out bythe centrifugal force., engenderedby the rotation of the impeller, into the space 24, and thence throughthe channels 25, to the outside of the casing.

It will be observed that the parts subject to wear, aside` from thejournals and bearings of the shaft, are the impeller; the diaphragm 20;the flange 21; and the bushing 14. These part are all easily gotten atfor repair, or for removal andreplacement, by simply disconnecting thejoints at 2 and 5.

The `above pump may be used by itself or as a member of a tandem, orseries of pumps, and in the latter case it may be the initial pump ofthe series or tandem, or one of the other pumps thereof.

Having thus described my invention and believing I have produced usefuland novel improvements in the art to which it appertains, let it beunderstood that I do not wish to be limited to the exact constructionand arrangement of the several parts composing the same, as many changescan be made lBvithout departing from the spirit thereof,

What Iv claim and desire to secure by United. States Letters-Patent is:

l. A centrifugal pump comprising a casing having a chamber, a selfbalancing impeller provided with a chamber in its upper part,registering with said casing chamber, and a removable diaphragm betweensaid chambers provided with a port adapted to be -opened and closed bythe axial movement of said impeller.

, Q. A centrifugal pump comprising a casing having a chamber, a selfbalancing impeller provided with a chamber in its upper part oppositesaid casing chamber, and a diaphragm having ports near its peripheryadapted to open and close communication betweensaid chambers by theaxial movement of said impeller.

3. A centrifugal pump including a casing, having an upper chambertherein, closed by a removable diaphragm, downwardly projecting portsfrom said diaphragm communicating with a pressure chamber formed in theimpeller of the pump, an annular shoulder in said impeller surroundinsaid pressure chamber adapted to close sai ports and flanges on saiddiaphragm and said impeller coperating to partially seal said chamber inthe impeller.

4. A centrifugal pump comprising a casing, a self-balancing impellerprovided with a pressure chamber, a removable diaphragm, secured to saidcasing, adapted to close said pressure chamber and a downward projectingannular flange on said diaphragm engaging the upper part of saidimpeller and forming therebetween a running joint.

5. A centrifugal pump comprising a casing, a self-balancing impeller, aremovable diaphragm appl/ied to the casing and constituting with theimpeller, a pressure chamber and a removable running joint.

6. A centrifugal pump including a casing having an upper chamber thereinclosed by a removable diaphragm having a plurality of openings, a flangeon the impeller of the pump adapted to close said openings, flanges onsaid impeller and said diaphragm, cooperating to form a pressure chamberin said impeller.

7 A centrifugal pump including a casing having an upper chamber formedtherein closed by a removable diaphragm, downwardlv projecting portsfrom said diaphragm communicating. with a pressure chamber formed in theimpeller of the pump, an annular shoulder on said impeller adapted toclose said ports, flanges on said diaphragm and said impeller,coperating'to partially seal said chamber in the impeller, a throat onsaid impeller, a suction opening in said casing surrounding saidthroatand a removable bushing interposed between said throat and said suctionopening.

8. A centrifugal pump including a casing, having an upper chambertherein, closed by a removable diaphragm, ports in said diaphragmcommunicating with a pressure chamber formed in the impeller of thepump, a flange in said impeller adapted to 'close said ports, andflanges on said diaphragm and said impeller cooperating to partiallyseal said chamber in the impeller. 9. A centrifugal pump including acasing having an upper chamber formed therein i closed by a removablediaphragm, ports in said diaphragm communicating-with a pressure chamberformed in the impeller of the pump, a flange on said impeller adapted toclose said ports, flanges on said vdiaphragm and saidv impeller,coperating to partially seal said chamber in the impeller, a throat onsaid impeiler, a suction opening in said casing surrounding said throatand 'a removable bushing interposed between said throat and said suctionopening.

10. A centrifugal pump, comprising acasing, a Self-balancing impelierprovided With an annular extending ange forming a run- 10 ning jointWith the suction, a shoulder on said flange and a removable invertedIL-shaped In testimony that I claim the foregoing, I 15 have hereto setmy hand this 11th day of July, 1913.

FERDXNAND W. KROGH.

Witnesses:

J. C. MARTIN, o D. B. RioHARDs.

